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screening, TPH field meter etc.). If necessary a grab sample will be submitted for <br />laboratory analysis in accordance with the QA Plan and analytical procedures described <br />in Section 4.1. <br />Previous investigations in the gravel lease area revealed the presence of low levels of <br />benzene in several monitoring wells and free product in MW-2, MW-4 and WP-3 just <br />north of the area. Fluid levels will be routinely monitored in select groundwater <br />monitoring wells as detailed in Section 3.2. As the discharge of pumped groundwater and <br />effluent monitoring will be regulated under the Discharge Permit, no additional <br />groundwater sampling is anticipated under this WMCP. However, in the event <br />groundwater sampling and analysis of any of the monitoring wells is deemed necessary, it <br />will be conducted in accordance with the procedures stated in the QA Plan. <br />Field sampling equipment will be decontaminated prior to use at each location by <br />washing with anon-phosphate cleaner and double rinsing with distilled water. <br />Decontamination liquids and disposable field equipment (e.g. gloves, paper towels) will <br />be containerized and managed according to the Division's regulations. <br />4.3 Discharge Water Sampling. <br />A CDPS Minor Industrial Discharge Permit has been obtained for the pit dewatering and <br />washwater discharge associated with the sand and gravel mining operation. A copy of the <br />discharge permit is attached as Appendix C. Water pumped at the mine site will be routed <br />into anoxidation/aeration basin to be constructed initially in the middle portion of <br />Evaporation Pond No. 9. It is anticipated that the water pumping and sunlight exposure <br />will be sufficient to reduce groundwater hydrocazbon levels below the trigger levels <br />contained in the Discharge Permit. All dischazge activities will be performed in <br />accordance with the sand and gravel discharge permit monitoring requirements, and no <br />water will be allowed to leave the FMM property until the monitoring requirements are <br />satisfied. <br />Continuous observation of the dewatering system and the two trenches will be performed <br />by on-site workers to determine if hnpacted groundwater is encountered during mining <br />operations (as evidenced by the presence of oil, hydrocarbon odor, oily sheen, or other <br />unusual odor or appeazance). In the event that impacted groundwater is encountered <br />during then mine dewatering, the dewatering system will immediately be shut down and <br />MEI personnel will be contacted (at the telephone number found in Section 3.1) to <br />provide qualified personnel to investigate the groundwater situation. If necessary, <br />samples will be collected and submitted for laboratory analysis in accordance with the <br />procedures stated in the QA Plan andJor the dischazge permit. <br /> <br />n <br />